With the advent of positive psychology in second language (L2) learning, some researchers have undertaken empirical studies to explore emotional variables affecting L2 learning and how positive emotions can enhance the engagement of L2 learners. As an attempt to contribute to this research domain, this project sought to test a model of student engagement based on classroom social climate (CSC) and foreign language enjoyment (FLE) among English language learners in Iran. A sample of 386 intermediate English as a foreign language (EFL) learners took part in this survey by completing the online battery of questionnaires. Structural equation modeling (SEM) was employed for the analysis of the gathered data. The results showed that both CSC and FLE were significant predictors of student engagement, with FLE acting as a stronger predictor. Furthermore, CSC exerted a slight influence on FLE. The findings of the present study verify the contributions of positive psychology to L2 pedagogy, implying that pleasant perceptions of learning context and positive emotions can lead to further student engagement.

Nowadays, one of the main factors that plays a vital role in sports is beverages that have a great contribution on athletes’ food style and nutrition. The present study analyzed sports beverages based on performance indicators of elite female badminton players in Iran. This study lasted eight weeks, supplying sport drinks and water to two different groups: one with Cytomax and one with water (79 participants). The data was obtained based on a 24-hour recall questionnaire in three different days every week. Additionally, skin folds brachial triceps index was used for body fat percent assessment. To measure peak of oxygen uptake (VO2max), the shuttle run submaximal test was applied. Additionally, to control the fluid intake, 150 ml of liquid for each 70 kg body weight every 15 minutes was recommended for each group; to control the blood volume changes related to plasma, the blood glucose, hematocrit, hemoglobin, sodium, and potassium were measured during three time periods of zero, 30 min and 90 min after the start. Finally, to measure performance, standardized tests measuring aerobic power, speed, flexibility, agility, muscular strength, and endurance indicators were used. The findings showed that supplying enough water, fluids, energy, carbohydrate, protein, and fat during exercising plays an imperative role in increasing the level of female badminton players’ performance.

Sports beverages assumed as one the principle factor on players' performance, and impact on their indicators, noticeably. Gatorade beverage is one of this primary beverages that in present study focused on its impact on elite female badminton players' performance in Iran. In the present survey has been considered in 2 groups of Gatorade and control that included 79 participants. The data has been got based on 24 hours' recall questionnaire on three different days in every week. As well, skin folds' brachial triceps index was applied for body fat percent assessment. To quantity VO2max, Shuttle runs sub-maximal test was used. Also, for controlling fluid intake in every two groups based on players' body weight,150 ml per every 70 kg weight for every 15 minutes was recommended. Besides, for control of blood volume changes related to plasma blood glucose, hematocrit, hemoglobin, sodium, and potassium was measured during three time periods of zero, 30 minutes after the start and 90 minutes after the start. To end, to measure performance, standardized tests measure the indicators: aerobic power, speed, flexibilityy, agility, muscular strength, and endurance were used. The results showed that supply adequate water and fluids in during of sport, play a critical role in gaining the high level of female badminton players' performance. In truth, the players who supply enough water shown better performance as compared with those who provide Gatorade beverage.

Aggression is one of the general phenomenon that athletes often directly or indirectly deal with. There are rare issues that are significant as much aggression and violence in sport. The explanation for violent behavior in humans is often the subject of research in the science of sociology. Social changes around the world in recent centuries had a significant impact on cultural structure. In this study, the researchers focused on the aggression of professional and semi-professional athletes in Taekwondo in Isfahan, Iran. The cross-sectional method was applied in this study. To analyze, we examined the relationships between predictor variables and the dependent variable or the variance criterion to explain the changes. The results shown that there was no significant difference between terms of anger and physical aggression among professional and semi-professional. On the other hand, there was meaningful differences between verbal aggression and hostility amongst participants. In addition, the amounts of aggression amongst professional players were more than semi-professional players.

This study examined the role of cultural capital sport oriented on workers' participation. The active presence of workers in different workplaces is very significant; additionally, consider their physical health is so imperative. Moreover, distinguishing the effective factors that can increase the amount of workers' physical health and persuade them to exercise is essential; also, lack of attention to them leads to several difficulties. In the study, focused on 400 workers who worked for the newspaper in Tehran, Iran. One questionnaire for assessing demographic factors and cultural capital sport oriented were used. Findings of the study showed that cultural capital sport oriented have significant relationship with workers' participation. Also, body image determined as the first reason for sport among workers. In overall, the sport has a noticeable role in workers' life and it can grow their mind and body health. In this regard, the head of workers should be developed some methods for introducing workers to the sport; likewise, determined valuable programs for them to increase physical power and growing muscles.